Bushing, fuse and fuseholder

ABSTRACT

A bushing, fuse and fuseholder especially useful in electrical apparatus such as distribution transformers for underground power distribution systems. The electrical apparatus is provided with a bushing, a fuse and a fuseholder, the fuseholder being secured to the wall of the apparatus and extending into the interior thereof. The bushing has the fuse secured thereto and is inserted into the fuseholder. The bottom of the fuse makes electrical contact with a lower contact in the fuseholder. The upper portion of the fuse makes contact with the bushing to provide electrical continuity through the bushing and the fuse to the bottom contact in the fuseholder. The bushing may be in the form of an adapter to receive a standard bushing insert or it may include the insert. A standard elbow termination or similar member may be attached to the bushing to energize the electrical apparatus through the fuse and fuseholder. In another embodiment, the fuseholder has a second contact to allow use with loop feed distribution.

[ Aug. 13, 1974 United States Patent Giegerich BUSHING, FUSE AND F USEHOLDER Prima Examiner-J. D. Miller 1 d v. P t I ry Inventor f g? Glegench ms 18 d Ass/slant Exammer-Fred E. Bell Attorney, Agent, or Firm-Francis X. Doyle; John J. Kelleher; Volker R. Ulbrich [73] Assignee: General Electric Company,

Pittsfield, Mass.

[22] Filed:

Dec. 22, 1971 ABSTRACT A bushing, fuse and fuseholder especially useful In electrical apparatus such as distribution transformers for underground power distribution systems. The elec- Appl. No.: 211,017

52 us. 337/202, 337/205, 337 207 hiwl apparatus is Provided with a bushing, a fuse and [51] Int. Cl. H0lh 85/02 a fuseholder, the fuse-holder being Secured to the Wall of the apparatus and extending into the interior thereof. The bushing has the fuse secured thereto and 7 0 2 m .2 m 72 3 117 8 6 00 l 2 0 2 0 "m h m3, 8R e S3 5 um i F l 8 5 l is inserted into the fuseholder. The bottom of the fuse makes electrical contact with a lower contact in the [56] References Cited UNITED STATES PATENTS fuseholder. The upper portion of the fuse makes contact with the bushing to provide electrical continuity through the bushing and the fuse to the bottom contact in the fuseholder. The bushing may be in the form of an adapter to receive a standard bushing in sert or it may include the insert. A standard elbow termination or similar member may be attached to the bushing to energize the electrical apparatus through the fuse and fuseholder. In another embodiment, the

rccen T1 U ..l.lTO8C DFBNGARHK 26500900 0 4566. 999999999 .lllllllll 0 6052 7752659 5 9900 2647 27000 3 92 490oo7 555 122333333 fuseholder has a second Contact to allow use with loop FOREIGN PATENTS OR APPLICATIONS feed dlsthbuhvh- 480,690 2/1938 Great 337/207 11 Claims, 9 Drawing Figures \EI 1 s. TTT

aggamg PATENIEIJAus 13 m4 IIIIIIIl/ll PATENTEDnuma 1914 3.8291310 am a or 4 BUSHING, FUSE AND FUSEHOLDER BACKGROUND This invention relates to a fuseholder and more particularly to a bushing, fuse and fuseholder for use with electrical apparatus such as distribution transformers to provide easily accessible fusing for such apparatus.

There is presently a well defined, growing trend in the electrical distribution field from overhead, open wire electrical distribution to underground, buried wire distribution. With this growing trend, many utilities are evolving new operating procedures to develop safe, efficient operating practices for underground servicing. At the same time, the equipment manufacturers are attempting to build distribution equipment which may be used with these new operating procedures. Many types of distribution apparatus are now provided with removable fuses which may be readily removed from the outside of the apparatus and may be replaced in the event of faults which may occur within the electrical apparatus, With these types of removable fuses, many of the utilities require that a switch be provided in series with the removable fuse such that the switch may be first operated prior to removal of such fuse. In many instances, in following these numerous operating procedures the fuse is removed prior to operating or performing a service function on the electrical apparatus, since the removal of the fuse provides a positive visually verifiable opening of the circuit to the electrical apparatus.

Many of these fuses are not current interrupting devices in the manner of a switch since they are not de signed to be removed while the electrical current is applied to the fuse. In order to provide safe operating procedures for the removal of fuses, it is desirable to provide with such fuses a switch operating device such that the switch, in series with the fuse, must be opened prior to the removal of the fuse. In those instances, where switches are provided in series with the fuse, but are not required to be operated prior to removal of the fuse, it is possible for the lineman, or other serviceman, working on the electrical apparatus to forget to open the switch prior to removing the fuse. As is well known in this art, the electrical arc buildup in removal of the fuse may be sufficient to actually blow the fuse out of the transformer, or to cause a line to ground fault either of which may injure the operator and possibly damage the equipment. Therefore, it is considered desirable to provide a switch in series with the fuse which must be opened prior to removal of the fuse.

In the underground distribution field, much use is now made of cable terminations which may be removed from the transformer with a hotstick. The transformer is normally provided with a bushing well and a bushing insert which provides a means to receive the cable termination. Many cable terminations also provide a loadbreak function such that it can be used as a switch to remove power from the transformer. It is considered desirable to use a cable termination as a switch for a fuse such that the fuse cannot be removed prior to removal of the termination. This will insure that the fuse is only removed after current has been removed from the electrical apparatus. Also, by providing a fuse in a bushing, fuseholder combination, the fuse may be more easily removed. It will be in a very accessible place on the transformer, since terminations are always placed in an accessible position. Further, by use of a fuse in a fuseholder in combination with a bushing, they will require less room on the cover or wall of the electrical apparatus than would a separate fuseholder.

It is, therefore, an object of this invention to provide a combination bushing, fuse and fuseholder assembly for an electrical apparatus.

A further object ofthis invention is to provide a bushing, fuse and fuseholder that provides a means for mounting a fuse in an electrical apparatus and wherein the fuse is readily removable and replaceable as desired.

A still further object of this invention is to provide a bushing, fuse and fuseholder for use with a loadbreak cable termination such that the fuse in the fuseholder cannot be removed prior to removal of the cable termination.

SUMMARY OF INVENTION Briefly, in one form, this invention comprises a bushing, fuse and fuseholder combination for use with electrical apparatus such as distribution transformers. The fuseholder is preferably a molded resinous member provided with a flange for mounting to the wall or cover of electrical apparatus. The fuseholder is dimensioned to receive a fuse and has a lower contact receiving the fuse contact for connection to the internal mechanism, such as the primary coil, of an electrical apparatus. A bushing member mounts in the top of a f useholder and has an internalcontact for connection to the other fuse contact. The bushing member prefera bly has a bail for inserting and removing the bushing from the fuseholder. The fuse is removable together with the bushing.

In one embodiment an adapter member is provided which is insertable into the fuseholder and carries the fuse. The adapter will accept various types of bushing inserts from various manufacturers and of various ratings.

For use with a loop feed connection, a second contact may be provided in the fuseholder which is connected to the contact of the bushing. This will insure that the feed through connection remains energized even though the fuse should blow.

The invention which is sought to be protected will be particularly pointed out and distinctly claimed in the claims appended hereto. However, it is believed that this invention and the manner in which its various objects and advantages are obtained as well as other objects and advantages thereof will be better understood from the following detailed description of a preferred embodiment thereof particularly when considered in the light of the accompanying drawings.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is an exploded side view of a commercial loadbreak cable termination and bushing of the prior art;

FIG. 2 is an exploded side view of the bushing, fuse and fuseholder of this invention;

FIG. 2a is a side view of an adapter according to one feature of this invention;

FIG. 3 is an enlarged assembled, partial sectional view of a preferred form of bushing, fuse and fuseholder according to this invention;

FIG. 3a is an enlarged, partial sectional view similar to FIG. 3, but showing a modified form of fuseholder for use in a loop feed distribution system;

FIG. 4 is a top view of one form of flange and locking member for use with this invention;

FIG. 5 is a side view of the flange and locking member shown in FIG. 4;

FIG. 6 is a perspective view showing one form of locking means according to this invention in open or unlocked position; and

FIG. 7 is a perspective view similar to FIG. 6 showing the locking means in fully closed or locked position.

DESCRIPTION OF PREFERRED EMBODIMENT As earlier noted, this invention relates to a combination bushing, fuse and fuseholder for use with electrical apparatus such as distribution transformers. The invention finds a special utility in pad mounted transformers and in underground transformers in vaults and in any other electrical apparatus where it is desirable to provide a readily accessible fuse that can be changed out as necessary. It will, of course, be obvious to those skilled in the art that the fuse can be mounted on a side wall, top wall, or cover of the electrical apparatus as desired. In this application, the term wall will be used to include all walls as well as the cover of the electrical apparatus. The preferred embodiment set forth herein discloses the present, specific construction believed most suitable for obtaining the various objects and advantages of this invention. Obviously, many changes may be made in various constructional details without departing from the scope of the invention herein defined.

Referring now to the drawings in which like numerals are used to indicate like parts throughout. Referring first to FIG. 1, there is shown a prior art commercial loadbreak termination. This prior art termination comprises an elbow type cable termination 10, a loadbreak bushing insert 12, and a bushing well 14. In the normal practice, the bushing well is welded or clamped to the wall or cover of the transformer (not shown).

Referring now to FIG. 2, the invention is broadly shown as comprising a bushing insert 16 which is very similar to the insert 12 of FIG. 1 but is enlarged at the lower end 18, as shown. The lower end could be a separate adapter 18a, as is shown in FIG. 2a. which could receive the bushing insert 12 of the prior art and adapted for use with the fuseholder of this invention. The fuseholder 20 is an enlarged bushing well, considering it comparable to the bushing well 14 of FIG. 1, providing room for a fuse member 22 which is preferably a current limiting fuse. For purposes of description, the member 20 will be referred to as a fuse holder, member 16 with adapter 18a will be considered as the bushing and member 22 as a fuse.

Referring now to FIG. 3, the preferred constructional details of this invention will be described. FIG. 3 is an enlarged, partial sectional view of the assembled parts of the bushing, fuse and fuseholder of this invention. As is shown in FIG. 3, the bushing 16 has the fuse 22 secured thereto and is assembled with the fuseholder 20 which is mounted in the wall 26 of an electrical appara tus. As is shown, fuseholder 20 is molded of a desired high dielectric strength resinous material. A preferred type of resinous material is an epoxy resin. although other types of resin may, of course, be used. A metal flange 24 is molded into the fuseholder 20, preferably in a manner taught by US. Pat. No. 3,388,212 which is assigned to the same assignee as this application. The fuseholder 20 may be secured to the wall 26 of an electrical apparatus, not otherwise shown, by welding, bolting, clamping or any other desired manner. Welding is the preferred manner of securing the fuseholder to the electrical apparatus as it provides for an hermetic seal. A contact 28 is molded into the bottom of the fuseholder 20 as is shown in FIG. 3a. Inone form, the contact 28 may include a flanged portion 30 which is molded into the bottom wall of the fuseholder in the same manner as the flange 24. A bayonet type contact 32 is provided on the interior of the fuseholder 20 for providing a connection to the contact 34 of fuse 22 as shown. An external contact 36 is also provided in contact 28 for making an electrical connection to the interior of the electrical apparatus, for example, to the primary coil of such electrical apparatus (not shown). The upper end of fuseholder 20 receives the bushing 16 as is shown.

The bushing 16 is molded of a resinous, high dielectric strength elastomeric material. Bushing 16 is pro vided with an opening or bore 38 which extends into a circular contact 40 as is shown. As will be understood, the bushing 16 receives a cable termination such as, for example, the cable termination 10 of FIG. 1 and the rod contact 11 of the cable termination 10 is inserted through the bore 38 and into the contact 40 providing the electrical connection thereto. In the preferred form of the invention, the intemal opening of fuseholder 20, indicated at 42, is tapered slightly as shown and the lower portion 18 of bushing 16 provided with a comparable taper on the portion 18 as shown. Thus, the bushing 1 makes a press fit with the internal portion 42 of fuseholder 20 and will preferably be locked in place in a manner to be more fully described as this specification proceeds. As is shown in FIG. 3, the bushing 16 is cross hatched to indicate one member 16 and a second member 18a which would be the adapter of FIG. 2a in the drawing. Of course, it should be understood that bushing 16 and member 18a could be molded ofa solid piece if desired. However, for use with the bushing inserts such as insert 12 of the prior art, it will be desirable to provide adapters such as adapter 18a so that the fuseholder 20 of this invention may be utilized with the bushing inserts which are readily available to the utilities of the country.

Where the insert 18a is provided, bushing 16 will have a threaded connector such as 44 which will thread into the connection 45 of the adapter 18a. Where they are made of one part, then connector 40 provides the connection for making contact with rod 11 of the elbow 10.

The fuse 22 is provided with an upper contact 46 and in the preferred form the upper contact 46 is secured by a set screw into connector 48 which forms part of bushing 16 or of the adapter 18a, if such is utilized. In this manner, the fuse 22 is securely held into the bushing 16 such that it will be readily insertable and removable from the fuseholder 20 with the bushing 16. As has been noted, contact 34 slides into the bayonet contact 32 of fuseholder 20 thereby providing an electrical path from the top of bushing 16 through the contact 36 of the fuseholder 20.

In some instances, it is desirable to utilize the fuseholder of this invention with transformers in what is termed a loop feed connection. Loop feed distribution systems are well known in the art and are described and schematically shown, for example, in US. Pat. No. 3,462,61 l which is assigned to the same assignee as this invention. For use in a loop feed connection, the bushing 16 is provided with an expandable contact 50 as is shown in FIG. 3a. The expandable contact 50 makes an electrical connection with a metallic sleeve 52 which is mounted within the fuseholder and, as can be seen, the sleeve 52 is connected to an external contact 54 substantially at the lower portion of the fuseholder 20. As is shown, a lead 56 is provided from contact 54, the lead 56 going to another bushing of the transformer (not shown) and on to a second transformer to provide the desired loop feed connection. When the sleeve 52 is used, an insulating sleeve 58 is also provided inside the fuseholder 20 to prevent any contact from the contact 34 of the fuse 22 with metal sleeve 52. The modification shown in FIG. 3a is a means of adapting the fuseholder of the invention to loop feed connections where desired.

In order to insert the bushing 16 and fuse 22 into fuseholder 20, a flange member 60 is provided on the bushing 16 and a pair of locking flanges 62 and 64 are welded to the wall 26 of the electrical apparatus in the manner particularly shown in FIGS. 4 and 5 of the drawing. The flange 60 has two cutout portions 66 and 68 which are comparable to, or which mate with the, locking flanges 62, 64 as clearly appears in the top view of FIG. 4. As is shown in FIG. 5, the locking flanges 62, 64 are upstanding from the wall 26 of the electrical apparatus and are provided with slots 70, only one shown in FIG. 5, for locking the bushing 16 in place as will more clearly appear from reference to FIGS. 6 and 7 of the drawing.

FIG. 6 is a perspective view of the bushing 16 and fuseholder 20 showing the bail 72 and locking member 74 just prior to engagement with, or release from, the slot 70 of the locking flange 64. Obviously, the same relationship will be true of the locking flange 62, which is not shown in FIG. 6. As can be seen, the bail 72 is pivoted to the flange 60 on the lower portion 18 of bushng 16 by a pivot pin 76. A locking pin 78 is also provided on the locking member 74, spaced from the pivot pin 76 in the manner shown. Bushing I6, bail 72 and flange 60 are turned counterclockwise as indicated by the arrow in FIG. 7 causing the locking pin 78 to move into slot 70. After locking pin 78 moves into slot 70, bail 72 is pivoted downward to the position shown in FIG. 7. As will be understood, as bail 72 ispivoted about the pin 76, the locking pin 78 will engage the upper edge of slot 70. This forces portion 18 of bushing I6 (or the bushing adapter 18a) into firm contact with tapered portion 42 (see FIG. 3), of fuseholder 20. The action of bail 72, pivot pin 70 and locking pin 78 firmly seats portion 18 of bushing 16 in the fuseholder 20 and thereby forces the contact 34 of fuse 22 into the bayonet contact 32 at the base of the fuseholder 20.

It will be apparent from the above description and a review of FIGS. 6 and 7 that pivoting of the bail 72 upwardly will cause pin 78 to engage the lower edge of slot 70. The engagement of pin 78 with the lower edge of slot 70 will withdraw bushing portion 18 (or the adapter 18a) from the fuseholder 20 as the bail 72 pivots about the pin 76. The bail 72, with bushing 16 and flange 60, may then be rotated clockwise to release locking pin 78 from the slot 70. The bail 72 and bushing 16 may then be withdrawn from the fuseholder 20. As will be understood, since fuse 22 is secured to portion 18 of bushing 16, the fuse 22 is also withdrawn from fuseholder 20. As shown in FIG. 7, the bail 72 is preferably provided with an eye 80 so that the bial 72 may be actuated by a "hotstick" in a well-known manner. From the above description it will be clear to those skilled in the art that by means of the bail 72, pivot pins 76, locking pins 78 and the locking flanges 62 and 64, that the bushing 16 together with the fuse 22 may be readily inserted into and withdrawn from the' fuseholder 20. Of course, it will be understood that in the above description, that although only flange 64 with pivot pin 76 and locking pin 78 are shown, that a similar pivot pin and locking pin are provided on the other side of flange 60 for engagement with the locking flange 62.

While there has been shown and described the present preferred embodiment of this invention, it will be understood by those skilled in this art that various constructional changes may be made as desired. As pointed out, the bushing 16 may be a single integrated member with enlarged portion 18, or an adapter 18a may be provided which will accept various types of prior art bushing inserts, such as insert 12 of FIG. 1. It should be noted that bail 72, and locking member 74 together with pivot 76 cooperate with flange 60 such that the fuse 22 and bushing 16 or adapter 18a, may be held by a hotstick and inserted horizontally into the fuseholder 22 when it is mounted on the side wall of a pad mounted transformer. Notches 66 and 68 are designed to cooperate with respective locking flanges 62 and 64 to insure that the adapter (or bushing 16) and fuse 22 can only be inserted into fuseholder 20 in proper position for latching the fuse and adapter. The scope of the disclosed invention is defined by the appended claims.

What is claimed as new and which it is desired to secure by Letters Patent of the United States is:

l. A bushing, fuse and fuseholder in combination, comprising:

a. a fuseholder formed of a high dielectricstrength resinous material,

I. said fuseholder having a metal flange molded therein, said metal flange being rigidly secured to the wall portion of an electrical apparatus,

2. said fuseholder having an eleetricalcontact secured in the bottom of said fuse holder and extending therethrough,

3. said fuseholder having a tapered opening adjacent said metal flange,

b. a bushing member, said bushing member having a tapered portion complementary to said tape-red opening of said fuseholder,

c. a fuse member, said fuse member secured to said tapered portion of said bushing and extending into said fuseholder, said fuse member having a contact engaging said electrical contact in the bottom of said fuseholder.

2. A bushing, fuse and fuseholder as set forth in claim I in which said bushing member is an adapter and has means for receiving and for securing a bushing insert thereto, said means including a portion extending through said adapter and secured to said fuse.

3. A bushing, fuse and fuseholder as set forth in claim 2 in which said adapter is provided with a bail, said bail being pivoted by pivot means to a flange on said adapter, and locking pins on said bail, said locking pins adjacent to but spaced from said pivot means.

4. A bushing, fuse and fuseholder as set forth in claim 3 in which locking flanges are provided on said wall portion of an electrical apparatus, said locking flanges having slots for receiving said locking pins.

5. A bushing, fuse and fuseholder, as set forth in claim 1 in which said bushing member is an integral member having an outer portion adapted to receive a cable termination and said tapered portion forms the inner portion of said bushing member.

6. A bushing, fuse and fuseholder as set forth in claim 5 in which said inner portion is provided with a flange, a bail, pivot means pivoting said bail to said flange, and locking pins on said bail adjacent to but spaced from said pivot means.

7. A bushing, fuse and fuseholder as set forth in claim 6 in which locking flanges are provided on said wall portion of an electrical apparatus, said locking flanges having locking slots for receiving said locking pins.

8. A bushing, fuse and fuseholder in combination, comprising:

a. a fuseholder formed of a high dielectric strength resinous material,

1. said fuseholder having a metal flange molded therein, said metal flange being rigidly secured to the wall portion of an electrical apparatus,

2. said fuseholder having an electrical contact secured in the bottom of said fuseholder and extending therethrough,

3. said fuseholder having a tapered opening adjacent said metal flange,

b. a bushing member, said bushing member mounted in said fuseholder and having a tapered portion complementary to and in contact with said tapered opening of said fuseholder,

c. a fuse member, said fuse member secured to said tapered portion of said bushing and extending into said fuseholder, said fuse member having a contact engaging said electrical contact in the bottom of Said fusholder. 9. A bushing, fuse and fuseholder in combination comprising:

a. a fuseholder formed of a high dielectric strength resinous material,

I. such fuseholder having a metal flange molded therein, said metal flange being rigidly secured to the wall portion of an electrical apparatus,

2. said fuseholder having an electrical contact secured in the bottom of said fuseholder and extending therethrough,

3. said fuseholder having a tapered opening adjacent said metal flange b. a bushing member, said bushing member mounted in said fuseholder and having a tapered portion complementary to and in contact with said tapered opening of said fuseholder,

1. said bushing member formed of an elastomeric resinous material and having an electric contact partially in the form of a metallic bore,

c. a fuse member, means securing said fuse member to said tapered portion of said bushing and extending into said fuseholder,

1. said securing means including a contact on said fuse member secured to said electric contact on said bushing member,

2. said fuse member having a contact engaging said electrical contact in the bottom of said fuseholder.

10. A bushing, fuse and fuseholder as set forth in claim 9 in which said bushing member has a flange molded therein, a bail member, pivot means pivotally securing said bail to said flange and locking pins on said bail, said locking pins being adjacent to but spaced from said pivot means.

11. A bushing, fuse and fuseholder as set forth in claim 10, in which said bail, said pivot means and said flange cooperate to permit insertion of said fuse by said bail into said fuseholder in a horizontal position.

I =l l= l UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3 m an Dated m n 13 1514 Inventor(s) v It is certified, that error appears in the above-identified patent 4 and that said Letters Patent are hereby corrected as shown below:

001. 1 lim 50, following the word "which" insert switdi Col. 4, 1m 29, mm is before "provided" C01. 4, 1m; 31, "1" slmld be Q16 Signed and sealed this 28th day of January 1975.

(SEAL) Attest:

McCOY M. GIBSON JR. I c. MARSHALL DANN Attesting Officer Commissioner of Patents 

1. A bushing, fuse and fuseholder in combination, comprising: a. a fuseholder formed of a high dielectric strength resinous material,
 1. said fuseholder having a metal flange molded therein, said metal flange being rigidly secured to the wall portion of an electrical apparatus,
 2. said fuseholder having an electrical contact secured in the bottom of said fuse holder and extending therethrough,
 3. said fuseholder having a tapered opening adjacent said metal flange, b. a bushing member, said bushing member having a tapered portion complementary to said tapered opening of said fuseholder, c. a fuse member, said fuse member secured to said tapered portion of said bushing and extending into said fuseholder, said fuse member having a contact engaging said electrical contact in the bottom of said fuseholder.
 2. said fuseholder having an electrical contact secured in the bottom of said fuse holder and extending therethrough,
 2. said fuse member having a contact engaging said electrical contact in the bottom of said fuseholder.
 2. said fuseholder having an electrical contact secured in the bottom of said fuseholder and extending therethrough,
 2. said fuseholder having an electrical contact secured in the bottom of said fuseholder and extending therethrough,
 2. A bushing, fuse and fuseholder as set forth in claim 1 in which said bushing member is an adapter and has means for receiving and for securing a bushing insert thereto, said means including a portion extending through said adapter and secured to said fuse.
 3. said fuseholder having a tapered opening adjacent said metal flange, b. a bushing member, said bushing member having a tapered portion complementary to said tapered opening of said fuseholder, c. a fuse member, said fuse member secured to said tapered portion of said bushing and extending into said fuseholder, said fuse member having a contact engaging said electrical contact in the bottom of said fuseholder.
 3. A bushing, fuse and fuseholder as set forth in claim 2 in which said adapter is provided with a bail, said bail being pivoted by pivot means to a flange on said adapter, and locking pins on said bail, said locking pins adjacent to but spaced from said pivot means.
 3. said fuseholder having a tapered opening adjacent said metal flange, b. a bushing member, said bushing member mounted in said fuseholder and having a tapered portion complementary to and in contact with said tapered opening of said fuseholder, c. a fuse member, said fuse member secured to said tapered portion of said bushing and extending into saId fuseholder, said fuse member having a contact engaging said electrical contact in the bottom of said fusholder.
 3. said fuseholder having a tapered opening adjacent said metal flange b. a bushing member, said bushing member mounted in said fuseholder and having a tapered portion complementary to and in contact with said tapered opening of said fuseholder,
 4. A bushing, fuse and fuseholder as set forth in claim 3 in which locking flanges are provided on said wall portion of an electrical apparatus, said locking flanges having slots for receiving said locking pins.
 5. A bushing, fuse and fuseholder, as set forth in claim 1 in which said bushing member is an integral member having an outer portion adapted to receive a cable termination and said tapered portion forms the inner portion of said bushing member.
 6. A bushing, fuse and fuseholder as set forth in claim 5 in which said inner portion is provided with a flange, a bail, pivot means pivoting said bail to said flange, and locking pins on said bail adjacent to but spaced from said pivot means.
 7. A bushing, fuse and fuseholder as set forth in claim 6 in which locking flanges are provided on said wall portion of an electrical apparatus, said locking flanges having locking slots for receiving said locking pins.
 8. A bushing, fuse and fuseholder in combination, comprising: a. a fuseholder formed of a high dielectric strength resinous material,
 9. A bushing, fuse and fuseholder in combination comprising: a. a fuseholder formed of a high dielectric strength resinous material,
 10. A bushing, fuse and fuseholder as set forth in claim 9 in which said bushing member has a flange molded therein, a bail member, pivot means pivotally securing said bail to said flange and locking pins on said bail, said locking pins being adjacent to but spaced from said pivot means.
 11. A bushing, fuse and fuseholder as set forth in claim 10, in which said bail, said pivot means and said flange cooperate to permit insertion of said fuse by said bail into said fuseholder in a horizontal position. 